const mongoose = require('mongoose')

const Image = mongoose.model('Image')
const Comment = mongoose.model('Comment')

module.exports = () =>
  Promise.all([
    Image.aggregate([{
        $group:{
            _id:'total',
            images:{$sum:1},
            views:{$sum:'$views'},
            likes:{$sum:'$likes'}
        }
    }]),
    Comment.count()
    ])
    .then(([docs,commentNum]) => ({
        images: docs[0].images,
        views: docs[0].views,
        likes: docs[0].likes,
        comments: commentNum
    }))
